UFO

The year is 1980 and Earth is secretly under attack from Aliens who are harvesting human body parts in order to save their own race. To stop this menace, a secret organization known as SHADO, or Supreme Headquarters Alien Defence Organization, is formed to defend the Earth from the attacks.
SHADO consists of a Moonbase with fighter spacecraft to intercept the aliens before they get to Earth, a SkyDiver submarine with a launchable fighter should they get by the Moonbase, and various ground based assault vehicles should they get by all the other Earth defences.
The SHADO operations are coordinated from a movie studio front, known as Harlington-Straker studios. Underneath the movie studio grounds lies a vast operational complex run by the man in charge of the organization, Commander Ed Straker.